Deathblow, I'm not sure about the difference in the NB and BB, however, the sound vs. speed curves that Amizaur designed for the Akula II for our mod make it less quiet than a 688i @ 0-4kts and louder above that speed, when it's active quieting measures are much less effective.
I'm not entirely clear on how he did that, but you can look at the thrusts in our database and probably get a good idea of how to go.
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LW
 
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